Cloud-Based Private Branch Exchange Call Flip

2. The method of claim 1, wherein the request is a session initiation protocol (SIP) transfer request.

4. The method of claim 3, wherein the one or more call flip rules include a rule restricting a time of day when one or more of the one or more additional devices is permitting to be caused to ring for a transfer.

5. The method of claim 3, wherein the one or more call flip rules include a rule restricting one or more of the one or more additional devices from being caused to ring for a transfer from the first device.

6. The method of claim 1, wherein the first device has a dedicated button on it assigned to a call flipping function and selection of the dedicated button causes the request from the first device to transfer the phone call currently active on the first device to an extension corresponding to the first device to be sent to the cloud-based PBX.

7. The method of claim 1, wherein the cloud-based PBX is connected to a publicly switched telephone network (PSTN) and the active call is between the first device and a phone on the PSTN.

9. The system of claim 8, wherein the request is a session initiation protocol (SIP) transfer request.

11. The system of claim 10, wherein the one or more call flip rules include a rule restricting a time of day when one or more of the one or more additional devices is permitting to be caused to ring for a transfer.

12. The system of claim 10, wherein the one or more call flip rules include a rule restricting one or more of the one or more additional devices from being caused to ring for a transfer from the first device.

13. The system of claim 8, wherein the first device has a dedicated button on it assigned to a call flipping function and selection of the dedicated button causes the request from the first device to transfer the phone call currently active on the first device to an extension corresponding to the first device to be sent to the cloud-based PBX.

14. The system of claim 8, wherein the cloud-based PBX is connected to a publicly switched telephone network (PSTN) and the active call is between the first device and a phone on the PSTN.

16. The non-transitory machine-readable storage medium of claim 15, wherein the request is a session initiation protocol (SIP) transfer request.

18. The non-transitory machine-readable storage medium of claim 17, wherein the one or more call flip rules include a rule restricting a time of day when one or more of the one or more additional devices is permitting to be caused to ring for a transfer.

19. The non-transitory machine-readable storage medium of claim 17, wherein the one or more call flip rules include a rule restricting one or more of the one or more additional devices from being caused to ring for a transfer from the first device.

20. The non-transitory machine-readable storage medium of claim 15, wherein the first device has a dedicated button on it assigned to a call flipping function and selection of the dedicated button causes the request from the first device to transfer a phone call currently active on the first device to an extension corresponding to the first device to be sent to the cloud-based PBX.